Method of making box-joints



B. A. LANGE.

METHOD OF MAKING BOX JOINTS.

APPLICATION mgr; MAY24, 1920.

1,362,330. Patented Dec. 14, 1920.

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PATENT OFFICE.

IBERTHOLD A. LANGE, OF ST. LOUIS, MISSOURI.

METHOD or MAKING BOX-J'0I 1\TT$.-

Specification of Letters Patent. Patented D 14 1920 Application filed May 24, 1920. Serial No. 383,740.

To all whom it may concern Be it known that I, BERTHOLD A. LANGE, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Methods of Making Box- Joints,of which the following is a specification.

The object of this invention is to provide a cheap and speedy means of creasing the paste board, fiber-board, strawboard, or the like of which boxes are made at certain lines so that the corners of the box may be quickly and efliciently formed from said creases. To do this dies are brought together by any suitable means, the material being engaged between said dies in such a manner as to form the creases in the said material. Previous to my invention, it has been the practice to form these creases by two or more operations. By the use of my invention it ispossible to form any number of such creases at the same time by a continuous operation. It is also possible, with minor changes in the shape of said dies, to form creases of any desired cross-section. It will be understood that the term corners as herein used applies to such construction whether in a vertical or horizontal plane, 2'. 6., whether along what are usually called edges or at ,What are usually called corners.

In the accompanying drawings forming fboart of this specification, in which like numers of reference denote like parts wherever they occur,

Figure 1 is an end elevation showing a set of dies with the paste board in position;

Fig. 2 is a section taken on the line 2-2 of Fig. 1 showing the upper die member in a raised position;

Fig. 3 is a similar section showing the die member in a lower position;

Fig. 4 is an end elevation of the upper die member;

Figs. 5, 6, and 7 are cross-sectional views showing the corner construction of such boxes;

Fig. 8 is a fragmental perspective view showing a well-known type ,of box construction possible with the use of my invention;

Fig. 9 is a view of the blank from which the end of a solid-ended box is constructed;

Fig. 10 is a view showing the arrangement of dies used in the construction of the end of a solid ended box; and

Fig. 11 is a sectional view showing how a plurality of dies may be employed at the same time.

The bed or lower die 1 has an upright guiding box 2 formed thereon. Guide-ways 4 are formed in said box at an angle, as shown in Figs. 2 and 3. These guide-ways receive tongues 3 formed upon the endsof the upper or movable die members 5. Upon the bed 1, is a groove or channel 6, as shown in Figs. 1, 2, and 3. The paste-board 7 is placed upon the bed 1, as shown in Fig. 2. The upper die 5 is then pressed downwardly by any suitable means and an extension 8 on the die 5 forces a portion of the paste-board 7 into groove 6 on the bed 1. Owing to the action of the guide-ways 4 upon the tongues 3, the die 5 is forced downwardly on the same angle that the guide-ways 4 are formed. This angular movement of the upper die member 5 effectually creases the paste-board at three points, viz.: at the point of the groove 6 and at the points designated by the numerals 9 and 10. The die member 5 descends with an appreciable force. This force tends to disarrange the. general structure of the paste-board-layers so that after the paste-board has been creased as described it may be easily bent so as to form av crease for said box. Obviously by changing the shape of the die members any desired corner construction may be obtained with this method of creasing. It is possible to put any number of creases in a piece of paste-board in one operation.

Fig. 11 shows an arrangement of dies for creasing the paste-board in a plurality of places at once. includes a plurality of grooves 6. A plurality of dies 5 are mounted as shown with the guiding slots 4 slanting downwardly toward the center 10 of thebed 1 for reasons hereinafter pointed outi As the creasing operation takes up a considerable amount of paste-board, it is necessary to stamp the two creases at 11 and 12 first, then the next two creases at 1-3 and 14 on either side of the center 10 are stamped. In case more than four creases are desired the operation continues in the same manner. When the two central creases 11 and 12 are formed it results in amovement of the paste-board toward the center 16 of the bed 1, as indicated by the arrows. Obviously, if the creases 13 and 14 were formed at the same time as the The bed 1 is extended and creases 11 and 12 it would result in the straining or breaking of the paste-board 7.

In the manufacture of paste-board boxes of the solid-end type, a blank 15, such as shown in Fig. 9, is used. It is creased along the dotted line 16, and the flaps 17 are bent upwardly and attached by staples 18 (see Fig. 8) to the side walls 19 of the paste-board box. This method of creasing allows these four creases 16 to be put into the blank 15 in one operation. placed as shown in Fig. 10 in uprights 20 mounted upon a rectangular bed 21. The die members 5 are placed at right angles, as shown, and are moved down into the pasteboard in pairs so as not to strain said pasteboard, as mentioned above.

After the paste-board 7 has been creased as shown in Figs. 2 and 3, a corner is formed along said crease, as shown in Fig. 5. The

excess paste-board on. the inner side of the corner extends as at 22 from one side 23 of the box and forms a rightangle brace for the adjacent wall 24 of the paste-board box. Tn using the exces paste-board in this way, the paste-board is prevented from bulging at the outer edge of the corner 25. This permits the boxes to be'packed closer together when shipping and gives a stronger box corner. Obviously, by-changing the mounting of the dies 5, any desired shape of paste-board may be creased. With this method of creasing a much greater range is provided. The manufacture of paste-board boxes is by this invention cheapened and the mechanism necessary to form the creases in said boxes is materially reduced.

Having thus described this invention, I hereby reserve the benefit of; all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from the To do this the dies are die moving in a path at an inclination to the plane of the material.

2. The improved method of creasing pasteboard and similar materials between dies, consisting in moving the male die at an in clination to the surface of the material, and continuing such movement to an extent exceeding the thickness of the material.

3. The improved method of forming a corner crease in paste-board and similar box material, consisting in compressing the material between a male and female die with the male die moving at an angle to the surface of the material other than a right angle, and the female die being formed with a recess to permit the inclined IIlOX'QIIlQIliL of the male die.

4:. The improved method of forming corner creases in box material, consisting in forming the material between (lies with one of said dies moving at an inclination to the plane of the other to draw the material in one direction and with the moving die.

5. The herein descried method of forming a plurality of corner creases in box material in a single operation, and between'sets of cooperating dies, one die of each set moving at an inclination to the plane of the material, and drawing the material in the direction of movement of the die, the moving dies of the respective sets being operated in a sequence to avoid lengthwise strain on the material.

In testimony whereof I hereunto affix my signature.

BERTHOLD A. LANGE. 

